Living organisms

• The living creatures of all kinds are known as living organisms.
• For example, all plants, animals, and microorganisms are living organisms.

Characteristics of Living Organisms

•  Living organisms are made up of cells – The organisms made up of a single cell are called unicellular and those made up of many cells are called multi-cellular.
• All living or organisms require food – The organisms that can synthesize their own food are called autotrophs such as green plants. The organisms that cannot make their own food but depend upon either plants or other animals are called heterotrophs.
• All living organisms shown growth.
• All living organisms respire – The process of taking in oxygen and giving off carbon dioxide is called external respiration. On the other hand, when oxygen is used by cells to release energy, the process is called internal respiration. All living things respond to
• Stimuli.
• All living things excrete – The process of elimination of waste material from the body is called excretion.

All living things reproduce – The process by which living organisms produce more of their kind is called reproduction.